On screen
Cast
22 credited performers
Boris Karloff
James Lee Wong
Grant Withers
Police Capt. Sam Street
Maxine Jennings
Myra Ross
Evelyn Brent
Olga Petroff / Countess Dubois / Sophie Dome
George Lloyd
Devlin
Lucien Prival
Anton Mohl
John St. Polis
Carl Roemer
William Gould
Theodore Meisle
Hooper Atchley
Christian Wilk
John Hamilton
Simon Dayton
Wilbur Mack
Russell
Lee Tung Foo
Tchin
Lynton Brent
Tommy
Artwork unavailable
Grace Wood
Mrs. Roemer
Artwork unavailable
Frank Bruno
Lescardi (uncredited)
Ed Cassidy
Ambulance Doctor (uncredited)
Wheaton Chambers
Chemistry Lab Director (uncredited)
Clancy Cooper
Warehouse Man (uncredited)
Artwork unavailable
George DeNormand
John (uncredited)
Lester Dorr
Coroner (uncredited)
Herbert Evans
Wilk's Butler (uncredited)
Artwork unavailable
Dick Reinhart
Dock Worker (uncredited)